Binder MIMO channels.

摘要

Cable binders are commonly used communication media for local loop and multi-Gbps Ethernet over copper technology. Achieving higher data rates over such binders will require the development of better transmission methods that depend upon the modeling of the interaction between multiple loops in a binder.; This dissertation proposes using the multiple-input multiple-output (MIMO) transmission methods to achieve higher data rates over a cable binder. The underlying theory of this proposal is that crosstalk among the lines in a binder is the dominant constraint for high-speed communication, and that the MIMO transmission method offers a solution to eliminate the negative effects of such crosstalk. However, use of MIMO transmission requires a channel model of the binder. This dissertation introduces a MIMO channel model for characterization of a cable binder.; The binder model is based on multiconductor transmission line theory and uses parameters that can be obtained from electromagnetic theory or existing measured data. The model generates frequency-dependent matrix channel/binder transfer functions as a function of system parameters. For a binder with 2N wires, the binder can be treated as a N x N differential mode channel or a (2N - 1) x (2N - 1) common mode channel under proper source-load configurations.; To verify the binder MIMO channel model, simulation results are presented. It has been shown that the binder MIMO channel model can not only generate a realistic channel matrix suitable for MIMO transmission, but can also describe traditional differentially excited channels better than existing approaches.; Using channel matrices generated from the binder MIMO channel model, discrete multi-tone (DMT) based MIMO transmission systems are evaluated. The achievable data rate is shown to be much higher for a binder if the binder is modeled as a common mode MIMO channel rather than a differential model MIMO channel.; Finally, a performance assessment of DSL technology based on these methods finds practically achievable data rates of over one gigabit per second symmetric data rate over 4 twisted pairs (category 3) for 300 meter range are possible. This is referred to as Gigabit DSL (GDSL) in this work.